This is the third installment of "Terrors Unseen", a 1931 science fiction story by Harl Vincent, a prolific writers of the 1930s who has since fallen into obscurity. Since the story is now in the public domain, I have taken it upon myself to reprint it here on my blog, so that it will not be lost to posterity once the last copy of the March 1931 issue of Astounding Stories crumbles into dust. The first two installments of the story can be found here and here. And now, on with the show . . .
* * *
He half carried, half dragged the limp body through the door of the laboratory and propped it in a chair. It required but a moment for him to see that Shelton's injury was inconsequential. He had only been stunned and already showed signs of recovering.
"What is it, Mr. Vail? What's happened?" came the voice of Lina Shelton breathlessly. She was framed in the doorway, dressed now and panting from her exertions in responding to his call. "Oh, it's father," she wailed, dropping to her knees at his side. "He's been hurt. Badly, too."
"No, not badly, Miss Shelton. He'll be around in a minute. I'm sorry to have excited you, but when I called I feared it was worse than it is." He was washing the blood from her father's small wound as he spoke.
She took the basin from his hand, spilling some of the water in her eagerness. "Here, let me have that cloth," she demanded.
Eddie admired her as her deft fingers took up the task. She was as exquisite in a simple sport outfit as she had been in her bathing suit.
The scientist opened his eyes after a moment. Remembrance came at once and he sat erect in the chair, staring.
"Lina!" he exclaimed, grasping her hand conclusively. "You're here, thank God! I dreamed -- oh, it was horrible -- I dreamed they had you." He clung to her closely.
"They," she murmurred inquiringly.
"Yes. Two of them are loose now. It's danger for you, my dear. You must leave at once. No, no -- I can't let you out of my sight until they are captured or destroyed." He rose to his feet in his agitation and shook his head to clear it. He looked pleadingly at Eddie as if expecting him to offer a solution of the difficulty.
"Vail!" he exploded, then, pointing a shaking forefinger at an elaborate short-wave radio transmitter which occupied a corner of the large room, "I ask you to bear witness. That is the source of energy for these creations of mine and it's shut down. How on earth can they keep going? I ask you."
"Perhaps someone else, sir," Eddie suggested doubtfully. "Have you any enemies who might be able to duplicate the impulses of that apparatus?"
"Bah! Enemies, yes -- with Universal -- but none who could duplicate the complicated fequencies I use. My secrets are my own. I've never even put them on paper."
* * *
Eddie was examining the intricate apparatus. "You knew of the first one's escape, didn't you?" he asked. "How did it happen?"
Shelton again became the enthusiastic scientist. "Here," he said, "I'll show you and you can judge for yourself." He strode to the gleaming figure of a seven-foot robot of startlingly human-like appearance.
Lina let forth an exclamation of repugnance and fear.
"No, Mr. Shelton," Eddie objected. "The same thing will occur again. Then there will be three."
"We'll fix that, my boy." The scientist was removing cover plates from the hip joins of the mechanical man. "I'll disconnect the cables that feed the locomotors. He can't walk then."
Eddie was still doubtful but dared offer no further objection, especially since Lina Shelton was watching in wide-eyed silence. He examined the monster and saw that it was quite similar in outside appearance to those supplied by Universal for heavy manual labor, excepting that this one was armed as were those used for prison guards. There were the same articulated limbs and the various clamps and hooks for lifting and heavy hauling; the tentacles for grasping; machine guns front and back. Under the helical headpiece that was the antenna this robot seemed to have two eyes -- a new feature -- but closer examination showed these to be the twin lenses of a stereoscopic motion picture camera. This robot, then, could see. Or at least it could record what the lenses saw for its masters.
"There," Shelton grunted when he had finished his tinkering, "he's paralyzed from the waist down. Let this one try and get away from us."
"Guns aren't loaded, are they?" Eddie asked.
"Lord, no! Never have any of them loaded. That would be a fool stunt." Shelton had pulled the starting handle of a motor-generator and its rising whine accompanied his words.
* * *
The vacuum tubes of the transmitter glowed into life and the scientist manipulated the controls rapidly. Lina was watching the robot with fascinated awe. Its arms moved in obedience to the controls, tentacles waved and coiled; the humming of its internal mechanisms filled the room. The locomotion controls had no effect as the scientist had predicted. Eddie drew a sigh of relief.
"Now, Vail, watch," Shelton exulted. "I'll show you what I was doing with the first one." He closed a switch that lighted aother bank of vacuum tubes behind the control panel.
"You can make this one invisible?" Eddie asked incredulously.
"Certainly -- from the waist up. This ought to be good."
"Mind telling me the principle?"
"Not at all -- now. I've your promise of secrecy. It's a simple matter, Vail, really. Just a problem of wave motions -- light. Invisible light; the ultra-violet, you know. My robots are built of specially alloyed metals which permit great freedom of molecular vibration. The insulating materials and even the glass of the camera lenses are possessed of the same property. Get it? I merely set up a wave motion in the atoms of the material that is in synchronism with the frequency of ultra-violet light, which is invisible to the human eye. All visible colors are absorbed, or more accurately, none are reflected excepting the ultra-violet. Perfect transparency is obtained since there is neither refraction nor diffraction of the visible colors. And there you are!"
Eddie stared at the upper half of the robot and saw that it was changing color as Shelton tuned the transmitted wave. Then suddenly it was gone. The entire upper portion of the mechanism had vanished; had just snuffed out like the flame of a candle. He could see down into the tops of the thing's hollow legs. Shelton laughed at him as he stretched forth his hand and hesitatingly felt for the invisible mid-section and upper body. It was there all right, unyielding and cold, that metal body. But no trace of it was visible to the eye. He drew back his fingers as if they had touched a hot stove. The thing was positively uncanny.
"Dad! Turn it off -- please," Lina begged. "It's getting on my nerves. Please!"
Obligingly, Shelton pulled the switch. "Now you'll see," he said to Eddie, "whether the same thing happens. Watch."
* * *
Mistily at first, the outlines of the monster's torso and arms came into view, semi-transparent but clouding rapidly to opacity. Then it glinted with the barely visible violent, a solid once more, rigid and motionless. It was a lifeless mechanism, for the source of its energy had been cut off. Eddie had an almost irresistible impulse to pinch himself.
Then he gasped audiibly, as did Shelton, for the thing snuffed out of sight again without warning, and the hum of its many motors resumed. There came a terrific clanking as it waved arms and tentacles and violently thrashed with its upper body. But the visible portion, its legs, remained rooted to the floor of the laboratory. Lucky it was that the scientist had disconnected those wires; lucky too that the machine guns were empty of ammunition.
"There now -- see?" Shelton's voice rose excitedly. "It's been no fault of mine. The power is off but it moves -- it moves. What on earth do you suppose --"
Eddie's shout interrupted him. He had seen something at the window: a face pressed against the pane and contorted with unutterable malice. Then it was gone. With the shout of warning still in his throat, Eddie bounded through the door in pursuit of the intruder. Lina's cry of recognition followed him into the twilight. "Carlos!" she had called.
He saw a stocky figure slink around the corner of the laboratory and make for the underbrush beyond. In a flash he was after him. No, he thought grimly, Shelton hadn't any enemy clever enough to duplicate his transmitter! The hell he didn't! Who the devil was this fellow Carlos anyway? He tore savagely at the impeding branches as he plunged deeper and deeper into the thicket.
(continue on to Part 4)
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